dean gaudet wrote:> On Mon, 8 Jan 2007, H. Peter Anvin wrote:> >> I *definitely* support the concept that RDPMC 0 should could CPU cycles by>> convention in Linux.> > unfortunately that'd be very limiting and annoying on core2 processors > which have dedicated perf counters for clocks unhalted (actual vs. > nominal), but only 2 configurable perf counters. i forget what ecx value > gets you the dedicated counters... but a solution which might work would > be a syscall to return the perf counter number...> > or we could just merge perfmon ;)>

OK, if there are dedicated counters in hardware at a different number, we probably should make it an ELF entry value (no need to make it a syscall for a constant.)